Earlier quoted context omitted.
Well, he may not know much about Islam. I don't either. But even the page you linked quotes: "Fight those who believe not in Allah nor the Last Day, nor hold that forbidden which hath been forbidden by Allah and His Messenger, nor acknowledge the religion of Truth, (even if they are) of the People of the Book, until they pay the jizya with willing submission, and feel themselves subdued." "Jesus will come again, and…
The point is that this system, while penalizing non-muslims, allowed a mostly peaceful coexistence between different belief systems in the Islamic world, thus demonstrating by example that the notion of Islam not being compatible with other religions is wrong. On the other hand, the tolerance track record of, say, the Catholic Church was fairly dismal until its influence over politics became dramatically curtailed.
Simple test - any other religion with the same rule wouldn't be able to coexist peacefully. It's just luck that we have only one.